<template>
  <Layout>
    <Tabs class-prefix="type" :data-source="recordTypeList" :value.sync="type"/>
    <div class="chart-wrapper" ref="chartWrapper">
      <Chart class="chart" :options="chartOptions" />
    </div>
    <ol v-if="groupedList.length>0">
      <li v-for="(group, index) in groupedList" :key="index">
        <h3 class="title">{{ beautify(group.title) }} <span> ¥ {{group.total}}</span> </h3>
        <ol>
          <li v-for="item in group.items" :key="item.id"
              class="record"
          >
            <span> {{ tagString(item.tags) }} </span>
            <span class="notes">{{ item.notes }}</span>
            <span> ¥ {{ item.amount }} </span>
          </li>
        </ol>
      </li>
    </ol>
    <div v-else class="noResult">
      Oops!目前暂无相关记录～
    </div>
  </Layout>
</template>

<script lang="ts">
import Vue from 'vue';
import {Component} from 'vue-property-decorator';
import Tabs from '@/components/Tabs.vue';
import recordTypeList from '@/constants/recordTypeList';
import dayjs from 'dayjs';
import clone from '@/lib/clone';
import Chart from '@/components/Chart.vue';
import _ from 'lodash';
import day from 'dayjs';

@Component({
  components: {Tabs, Chart},
})
export default class Statistics extends Vue {
  tagString(tags: Tag[]) {
    return tags.length === 0 ? '无' :
        tags.map(t=>t.name).join('/');
  }
  mounted(){
    console.log(this.groupedList);
    const div = (this.$refs.chartWrapper as HTMLDivElement);
    div.scrollLeft = div.scrollWidth;
  }

  beautify(string: string) {
    const day = dayjs(string);
    const now = dayjs();
    if (day.isSame(now, 'day')) {
      return '今天';
    } else if (day.isSame(now.subtract(1, 'day'), 'day')) {
      return '昨天';
    } else if (day.isSame(now.subtract(2, 'day'), 'day')) {
      return '前天';
    } else if (day.isSame(now, 'year')) {
      return day.format('今年 MM月DD日');
    } else {
      return day.format('YYYY年 MM月DD日');
    }
  }

  get keyValueList(){
    const today = new Date()
    const array = []
    console.log(this.groupedList)
    for(let i=0; i<= 29; i++){
      //  this.recordList = [{date: 7.3, value: 100}, {date: 7.2, value: 200}]
      const dateString = day(today)
          .subtract(i, 'day').format('YYYY-MM-DD')
      const found = _.find(this.groupedList, {
        title: dateString
      })
      array.push( {
        key: dateString, value: found ? found.total : 0
      })
    }
    array.sort(
        (a, b) => {
          if(a.key > b.key){
            return 1
          }else if(a.key === b.key) {
            return 0;
          } else {
            return -1
          }
        });
    return array;
  }
  get chartOptions(){
    const keys = this.keyValueList.map(item=>item.key)
    const values = this.keyValueList.map(item=>item.value);
    return {
      grid:{
        left: 0,
        right: 0,
      },
      xAxis: {
        type: 'category',
        data: keys,
        axisTick: {alignWithLabel: true},
        axisLine: {lineStyle: {color: '#666'}},
        axisLabel: {
          formatter: function (value: string, index: number) {
            return value.substr(5);
          }
        }
      },
      yAxis: {
        type: 'value',
        show: false
      },
      series: [{
        symbol: 'circle',
        symbolSize: 10,
        itemStyle: {borderWidth: 1, color: '#666'},
        data: values,
        type: 'line'
      }],
      tooltip: {show: true, triggerOn: 'click',
        formatter: '{c}',
        position: 'top'
      }
    }
  }


  get recordList() {
    return (this.$store.state as RootState).recordList;
  }

  get groupedList() {
    const {recordList} = this;

    const newList = clone(recordList)
        .filter(r => r.type === this.type)
        .sort((a, b) => dayjs(b.createdAt).valueOf() - dayjs(a.createdAt).valueOf());
    if (newList.length === 0) {return [];}
    type Result = { title: string; total?: number; items: RecordItem[] }[]
    const result: Result = [{title: dayjs(newList[0].createdAt).format('YYYY-MM-DD'), items: [newList[0]]}];
    for(let i=1; i<newList.length; i++){
      const current = newList[i];
      const last = result[result.length - 1];
      if(dayjs(last.title).isSame(dayjs(current.createdAt), 'day')){
        last.items.push(current)
      }else{
        result.push({title: dayjs(current.createdAt).format('YYYY-MM-DD'), items: [current]})
      }
    }
    result.map(group => {
      group.total = group.items.reduce((sum, item)=> sum + item.amount, 0)
    })
    return result;
  }

  beforeCreate() {
    this.$store.commit('fetchRecords');
  }

  type = '-';
  recordTypeList = recordTypeList;
}
</script>


<style scoped lang="scss">
@import "~@/assets/style/helper.scss";
.echarts{
  max-width: 100%;
  height: 400px
}
.noResult{
  padding: 16px;
  text-align: center;
}
%item {
  padding: 8px 16px;
  line-height: 24px;
  display: flex;
  justify-content: space-between;
  align-content: center;
}

.title {
  @extend %item;
}

.record {
  background: white;
  @extend %item;
}

.notes {
  margin-right: auto;
  margin-left: 16px;
  color: $semi-highlight;
  font-style: italic;
}

.chart{
  width: 430%;
  &-wrapper {
    overflow: auto;
    &::-webkit-scrollbar {
      display: none;
    }
  }
}

::v-deep {
  .type-tabs-item {
    background: $bg-light;
    &.selected {
      background: $bg-light;
      &::after {
        background: rgb(124,84,255,0.25);
        //display: none;
      }
    }
  }

  .interval-tabs-item {
    height: 48px;
  }
}

</style>
